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USB HS in FS problem with CDC transmission

Question asked by Gosiewski._ukasz on Dec 14, 2016
Latest reply on Dec 17, 2016 by Gosiewski._ukasz


I use STM32F439 in HS in FS mode with CDC class. Apparenty even though messages are received by uC  in proper fashion and sent to PC as I coded them,  terminals on PC fail to receive/display them right. If there is no EOL sign in transmission, they seem to be stuck in some buffer and pushed off it late (in example I receive response to my first message after sending second or third) or lost or cut short. Same code worked perfectly fine with normal USB in FS on STM32F407 - no EOL needed to complete transmission. Switching back to normal FS is not an option for me. Does anyone knows what might cause this?